Touch Display Electrode Layout to Minimize Parasitic Capacitance
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Solution Overview
Problem
In touch screen panel integrated display devices, the overlap of data lines and signal lines with a first protective layer generates parasitic capacitance, leading to potential sensitivity and display quality deterioration during touch detection.
Innovation Solution
The display device includes pixel electrodes spaced apart, position detection electrodes forming capacitance with a position input body, and signal lines disposed such that they do not overlap the position detection line, reducing parasitic capacitance and enhancing sensitivity and display quality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If data lines and signal lines are arranged to overlap each other with a protective layer interposed, then device integration is improved, but parasitic capacitance increases leading to sensitivity deterioration
Solution Approach 1:
The patent transitions from a two-dimensional planar arrangement where data lines and signal lines overlap to a three-dimensional staggered configuration. The position detection line is arranged in a first plane while signal lines are arranged in a second plane at a different height, creating vertical separation. This dimensional change eliminates parasitic capacitance between these lines while maintaining device integration.
Solution Approach 2:
The patent extracts the position detection line from the same plane as the signal lines, placing it in a separate first plane while signal lines occupy a second plane. This separation removes the harmful parasitic capacitance interaction between position detection and signal lines, resolving the sensitivity deterioration issue while preserving the integrated display structure.
2Reliability
If signal lines are disposed adjacent to pixel electrodes, then connectivity is improved, but parasitic capacitance with position detection line increases
Solution Approach 1:
The patent uses vertical stacking to resolve the conflict between signal connectivity and parasitic capacitance. Signal lines are positioned in a second plane adjacent to pixel electrodes for reliable connectivity, while the position detection line is placed in a first plane at a different height. This three-dimensional arrangement maintains necessary electrical connections while eliminating harmful capacitive coupling.
3Manufacturing precision
If multiple signal lines are arranged in the display area, then image quality is improved, but frame width increases
Solution Approach 1:
The patent utilizes the vertical dimension to accommodate multiple signal lines in a stacked configuration rather than spreading them horizontally. By arranging signal lines in a second plane at a different height from the position detection line in the first plane, the design maintains high image definition with multiple signal lines while minimizing the horizontal frame width.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This configuration improves sensitivity and display quality by minimizing parasitic capacitance, allowing for high definition, narrow frames, and high aperture ratios while reducing production costs through optimized patterning and film usage.
Implementation Method 1
position detection electrodes, each of which is configured to form a capacitance with a position input body with which position input is performed to detect a position of the position input performed with the position input body
Data Source
AI summary
A display device includes pixel electrodes that are spaced apart from each other, touch electrodes, each of which forms a capacitance with a finger, which is a position input body performing position input, to detect a position of input by the finger, which is the position input body, a touch line that is sandwiched between adjacent pixel electrodes and is connected to the touch electrodes, and at least two source lines that extend parallel to the touch line. The source lines transmit image signals to the pixel electrodes. The source lines are disposed such that one of the two pixel electrodes is sandwiched between the touch line and one of the two source lines and another one of the two pixel electrodes is sandwiched between another one of the two source lines and the touch line.